Improved millstone-machine



@einen tatrastmt ffirr.

E. O. HENDERSON AND It. A. HENDERSON, OF ALBIA, IOWA.

Letters Patent No. 80,954, dated August 11, 1868.

IMPROVBD MILLSTONE-MAHINE.

TO ALL WI-IOM IT MAY CONOERN:

r Be it known that we,-E. C. HENDERSON and R. A. HENDERSON, of A1bia,inthe county of Monroe, and State of Iowa, have invented a new andimproved Millstonc-Dressing Machine; and we do hereby declare, that thefollowing is a full, clear, and exact description thereof, -which willenable those skilled in the art to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure l is a sectional elevation of ourinvention, the section being taken through the line :c :v of fig. 2.

Figure 2 is a top view of the machine.

Figure 3 is a detail end view ofthe lever-head and picking-plates.

Similar letters of reference indicate corresponding parts.

`The object of this invention is to provide a simple and effectivemachine forgdressing millstones in a uniform' and expeditionsmanner,whereby the operation of cutting the furrows in the stone can beperformed by a person not necessarily skilled in using the hand-pick forthe same' purpose. v l Y It consists of a pick, operated by a train ofmechanism, the motion of which is produced by simply turning ahand-crank In the accompanying drawings- A is the general frame of themachine.

B are bearing-blocks, which aiford bearings'for the shafts C D of themechanism operating the pick-lever E.

These blocks slide to and fro in grooves, a, in the frame of themachine, and are held within said grooves by the strap-plates G, one ofwhich is broken away in iig. 2, to exhibit the bearing-block B beneathit,

When the crank Il is turned, the blocks I3, and the entirepiek-mechanism which they4 support, are moved forward or backward bynneansoil the pinions I on the shaft C, which pinions engage with theracks J, ailixed in suitable positions to the frame A, as shown. i

Motion is communicated to the shaft D from the shaft C, by means ofengaging cog-wheels K and-L, keyed on their respectivo shafts, as shown,the wheel L being aurelativclysmall wheel or pinion, so that the shaft Dwill be revolved much faster than the shaft C, for `t-he purpose ofactuating the pick-lever E to vibrate rapidly, as it progresses,horizontally, and thus strikethe picking-plates M upon the stone in aclose succession oi' places. Y v

The vibration of the lever is accomplished by a cam or eccentric, O,keyed on the shaft D, the said eccentric revolving within an elongatedeye, l?, forming part of the lever, which, as onc end of the-said leveris pivoted on the shaft C as a centre, causes theY picking-plates Mheldin the lever-head Q to impinge upon the i face of the stone in arapid and regular manner.

In operation,the machine is laid upon the face of thc stone in thcproper direction for cutting the required furrow.

The crank-handle is then turned alternately in reverse directions, whichoperation moves the lever back and forth in thelsarnc line, and at thesaine time causes it to vibrate, thus inilicting a series of blows withthe picking-plates, whereby the face of the stone is dressed in themanner required. v

The head Q is formed with aldeep rectangular clove orslot, and providedwith set-screws, b, for holding any required number of picking-plates,so that furrows of diierentwidths may be cut by the same machine, whendesired. y

This form of the head is shown at fig. 3.

We claim as new, and desire to secure by Letters Patent 1. The slidingbearing-blocks B, operated by means of the rack and pinion I J, forgiving to the pick of a milIstone-dressing machine a horizontal motion,substantially as shown and described. I

2. The shafts C D, connected by gearing K L,'and provided with thepinions lI and eccentric, O, when said shafts have their berings in hesliding vblocks B, and are arranged, with relation to the rack J andframe A,

substantially as herein described.

3. The pick-lever E, when fitted at one end to turn upon the shaft C,und formed with an elongated eye, P, adapted to receive the eccentric,O, on shaft D, ysaid lever being arranged to be operated both verticallyand horizontally within the frm'e A, in the manner and by the nieansherein shown 'and described.

E. C. HENDERSON, R. .A. HENDERSON. Witnesses:

RUFUs B. TowNsENn, R. W. COURTNEY.

